Circuit breaker



July 21, 1931. c. A. UHEREK CIRCUIT BREAKER Filed Oct. 14. 1929 i Wm Rm W Patented July 21, 1931 UNITED STATES PATENT @FFICE CHARLES A. UHEREK, OF CHICAGO, ILLINOIS, ASSIGNOR TO INTERNATIONAL HAR- VESTER COMPANY, A CORPORATION OF NEW JERSEY CIRCUIT BREAKER Application filed October 14, 1929.

The invention relates to circuit breakers for magnetos.

In these devices a flat spring is employed to hold a movable breaker arm with its contact point engaging a stationary contact.

The circuit is broken when a cam actuates the movable arm against the force of the spring mentioned. This repeated functioning of the spring makes it important to provide a strong anchor for the working end thereof, lest, under the action of the repeated circuit interruptions, the spring weakens 211d. breaks, causing the circuit breaker to ail.

Accordingly, it is the main object to provide an improved main spring anchorage for circuit breakers.

Another object is generally to improve the construction of circuit breakers.

Other objects of the invention will become apparent to those skilled in this art as the disclosure is more fully made.

These desirable objects may be achieved in a practicable form of the invention illustrated in the accompanying sheet of drawings, wherein:

Figure 1 is a face view of the improved circuit breaker;

Figure 2 is a sectional view thereof, as

seen along the line 22 in Figure 1, when viewed in the direction of the arrows;

Figure 3 is a detail face view of the anchor element; and

Figure 4 is an end view of the anchor element.

The circuit breaker comprises the usual main plate or disk 10, including an integrally formed post 11 disposed oif-center. An insulated bushing 12 is fitted around the post 11, and, pivoted for movement on the bushing, is a bell crank lever 13 constituting the movable circuit breaker arm. The movable breaker point appears at 14:, and the usual wiper block actuated by a cam, not shown,

appears at 15. The usual flat spring pressed button 16 is provided to hold the arm 13 against displacement from the post 11.

A screw 17, surrounded by an insulated sleeve 18, is provided to secure a block 19 to the disk 10. This block carries the usual Serial No. 399,41 1.

stationary electrode 20. An interrupter screw or pin 21 is provided to secure the circuit breaker to the magneto armature, as in standard practice. An insulated sleeve 22 prevents metallic contact between the pin 21 and parts 10 and 19, as shown in Figure 2.

The improved anchor element is shown at 23 and comprises a flat arm apertured at 24: at one end to fit over the bushing 22 and also apertured at 24 to line up for position around the sleeve 18 and to extend in a radial direction therefrom between the parts 10 and 19, there being an insulated plate 25 interposed between these parts to prevent metallic contact therebetween. The anchor arm embodies at its free end an L-shaped extension 26 having a free edge bent out to form a stop shoulder or wall 27. Another opposed stop shoulder is provided at 27 on the anchor to help hold the spring straight.

A flat spring 28 has its ends strengthened by short spring inserts 28 and anchored by a screw 29 at one end to the breaker arm 13 and its other end riveted with a rivet 30 to the L-shaped extension 26 with one side thereof flush against the wall 27 This spring, as is known in the art, functions normally to exert a force holding the breaker points together for contact.

Thus, it can be seen that in the arm 23, with its L-shaped extension 26, has been provided a strong, compact anchorage for one end of the movable breaker arm spring. Quite obviously, this simple and effective structure achieves the desirable objects of the invention heretofore recited.

The scope of the invention is set forth in the appended definitions comprising the claims.

What is claimed is:

1. In a circuit breaker, a main disk carrying a post, a movable breaker arm on the post, a block carrying a stationary electrode secured to the disk, an anchor member between the block and disk, said member having an exposed free end, and a flat spring connected at one end to the movable breaker arm and at its other end to the free end of the anchor member.

2. In a circuit breaker, a main disk carrying a post, a movable breaker arm on the post, a block carrying a stationary electrode secured to the disk, an anchor member between the block and disk, said member having an angularly extended free end, and a flat spring connected at one end to the movable breaker arm and at its other end to the angularly extended free end.

3. In a circuit breaker, a main disk carrying a post, a movable breaker arm on the post, a block carrying a stationary electrode secured to the disk, an anchor member between the block and disk, said member having an L-shaped exposed free end, a shoulder extended outwardly from an edge of the L-shaped end, and a flat spring connected at one end to the movable breaker arm and at its other end to the L-shaped end with a side of the spring flush against said shoulder.

4. I11 a circuit breaker, a main disk carrying a post, a movable breaker arm on the post, a block carrying a stationary electrode secured to the disk, an anchor member between the block and disk, said member havmg an exposed free end, a flat spring connected at one end to the movable breaker arm and at its other end to the free end of the anchor member, and an insulator member between the block and anchor member.

5. In a circuit breaker, a main disk, a movable breaker arm carried on the disk, a block carrying a stationary electrode secured to the disk, an interrupter pin for connecting the breaker to the armature of a magneto or the like, an anchor member carried by the pin and arranged between the block and disk and provided with an exposed end, and a. spring connected to the breaker arm and to the exposed end of the anchor member.

In testimony whereof I afli x my signature.

CHARLES A. UHEREK. 

